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The first calculator with LED display to be successfully marketed was the small Busicom LE-120 "Hand y" in early 1971. Being based on semiconductor materials, the LED display is very compatible with calculator integrated circuits and has a moderately low power consumption.

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2014年1月3日 · The Executive was also the first calculator in the world to be powered by button cells, a trick achieved by pulsing them on and off to provide better battery life. With LCDs only just invented, power guzzling LEDs were the only viable display option in 1972.

Modeled after popular LED calculators of the 70's and 80's. You'll love this life-like vintage calculator with 3D buttons, push-down effects and shadows, just like the real thing! Many mathematical function keys, even has a sliding on-off switch! Settings menu allows you to choose your favorite LED color (Red, Blue, Green, or Amber!)

20mA will work for most leds. You can find the new and improved GURU at http://www.ledcalc.com/ !

WELCOME TO THE CALCULATOR MUSEUM. It contains over 140 calculators, starting with mechanical machines dating back to at least the 1920s to electronic pocket calculators …

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LED displays (7 or more individual LEDs) were introduced around 1967 but were very expensive. Calculators used LEDs that were arranged to form either a seven-segment display or a dot-matrix display.